Saliva Sampling Methods Optimized Using UHPLC-MS

Saliva: A New Frontier in Detecting Esophageal Cancer Risk

Scientists have long known that bile acids (BAs) play a crucial role in digestion and cholesterol regulation. But recent research suggests they may also hold the key to early detection of Barrett’s esophagus, a condition that can lead to esophageal cancer.

Barrett’s esophagus occurs when the tissue lining the esophagus is replaced by tissue similar to the intestine. This change increases the risk of developing esophageal cancer, making early detection vital. While the exact cause of Barrett’s esophagus is unknown, research indicates that exposure to bile acids during gastroesophageal reflux disease (GERD) plays a significant role.

Currently, diagnosing Barrett’s esophagus involves invasive procedures like endoscopy. However, a new study from the Institute of Analytical Chemistry of the Czech Academy of Sciences and Masaryk University in Brno, Czech Republic, suggests that saliva analysis could offer a less invasive alternative.

The researchers compared three saliva collection methods – spitting, Salivette swabs, and Salivette Cortisol swabs – finding that spitting yielded the highest bile acid recovery with the least interference. They then used ultrahigh-performance liquid chromatography-tandem mass spectrometry (UHPLC-MS/MS) to analyze the collected saliva samples. The results showed that bile acid levels in saliva remained stable for up to 14 days, demonstrating the potential for long-term storage.

Interestingly, bile acid levels in saliva fluctuated throughout the day, with the most significant changes observed after meals. This suggests that saliva collection during fasting periods may be optimal for future studies.

The researchers are currently applying these findings in a large clinical study to evaluate the potential of saliva bile acid profiling as a diagnostic marker for Barrett’s esophagus susceptibility. This groundbreaking research could revolutionize the way we detect and manage this potentially life-threatening condition.

References

(1) Dosedělová, V.; Laštovičková, M.; Konečný, Š.; Dolina, J.; Kubáň, P. Optimizatoin of Saliva Sampling Methods for Analysis of Bile Acids by UHPLC-MS. J. Chromatogr. A 2024, 1736, 465354. DOI: 10.1016/j.chroma.2024.465354

(2) LiverTox: Clinical and Research Information on Drug-Induced Liver Injury [Internet]. Bethesda, Maryland). National Institute of Diabetes and Digestive and Kidney Diseases; 2012-. Bile Acids. Updated 2017-09-25.